“A permanent base on Mars would have a number of advantages beyond being a bonanza for planetary science and geology. If, as some evidence suggests, exotic micro-organisms have arisen independently of terrestrial life, studying them could revolutionise biology, medicine and biotechnology.”

“I do like having my ears pierced, because there's a lot more choice in pierced earrings than there is with clip-ons, and they're a lot more comfortable to wear - Sometimes I completely forget I've got them in and end up going to sleep wearing them.”